设集合\(A=\left\{ x\left| 2a < x < a+1 \right. \right\}\),集合\(B=\left\{ \left.x \right|x < -1,或x > 3\right\} \).
\((1)\)若\(A\bigcap B=A\),求实数\(a\)的取值范围;
\((2)\)若\(A\bigcap B\ne \varnothing \),求实数\(a\)的取值范围.
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